A cable is usually a cable-like cable that is twisted from several or several sets of wires (at least two in each set). Each set of wires is insulated from each other and often twisted around a center. The entire outer bread has a height. Insulated overlay. Multiple erected in the air or installed underground or underwater for telecommunications or power transmission. Cables can be classified into power cables, communication cables, and control cables according to their uses. So what are the safety requirements when using cables?
1. When the cable lines cross each other, the high voltage cable should be below the low voltage cable. If one of the cables is protected by a pipe within 1 m before and after the intersection or separated by a partition, the minimum allowable distance is 0.25 m.
2. The distance between the cable and the foundation of the building should ensure that the cable is buried outside the building. When the cable is introduced into the building, the pipe should be protected. The protection pipe should also be outside the building.
3. When the cable crosses the railway or the road, it should be protected by a pipe. The protection pipe should extend beyond the track or road surface by 2m.
4. When the cable is close to or intersects with the heat pipe, if there is insulation, the minimum distance between parallel and cross is 0.5m and 0.25m respectively.
5. The distance between the cable directly buried in the ground and the grounding of the general grounding device should be 0.25~0.5m; the buried depth of the cable buried directly in the ground should not be less than 0.7m, and should be buried under the frozen soil layer.